JPS6211384Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a culm length detection device for a reaping harvester in which a plurality of culm presence/absence detection sensors are arranged side by side at appropriate intervals in the culm length direction of a target grain culm.

Conventionally, culm length is detected using a plurality of culm presence/absence detecting sensors arranged at appropriate intervals in the culm length direction, but when one of the sensors detects culm presence from culm absence, the position of the culm is Since the grain culm is long and is detected as a grain culm that is shorter than the sensor position located on the ear tip side of this sensor, in other words, the range between adjacent sensors in the culm length direction is detected as the same culm length range. If an attempt is made to perform multi-stage detection by reducing the range of the same culm length, a large number of sensors must be arranged side by side, making the overall structure complicated and expensive. In addition, when using a contact type sensor that is pressed and displaced by the grain culm, the provision of a large number of sensors as described above not only makes the entire structure expensive, but also causes the return force of the many sensors to adversely affect the grain culm. There is also a risk that the spikes will be pressed, resulting in poor detection accuracy.

The present invention has been made with the above-mentioned circumstances in mind, and in the culm length detection device having the above-mentioned structure,
A mechanism is provided for determining whether each of the sensors detects the presence of a culm from the absence of a culm, or the absence of a culm from a presence of a culm, and based on the determination result,
When one of the sensors detects the presence of a culm from the absence of a culm, a grain culm that is longer than this sensor position and in the center of the range between this sensor and a sensor adjacent to the tip side of the grain is detected. When the one sensor detects the presence of a culm to the absence of a culm, a sensor that is shorter than this sensor position and adjacent to this sensor and closer to the plant base side The grain culm is characterized by being configured to be detected as a grain culm that is longer than the center position of the range between.

In other words, focusing on the fact that the culm lengths of grain culms existing in the field do not vary greatly between adjacent grains, a discrimination mechanism is used to divide the range between adjacent sensors into two culm length ranges in a multi-stage manner. As a result, it has become possible to perform multi-stage culm length detection with a small number of sensors arranged side by side.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a side view showing the front part of the combine harvester, in which the front part of the combine harvester 3 equipped with a crawler traveling device 1 and a threshing device 2 is equipped with a pulling device 4 that acts on multiple grain culm rows, and a reaping device 4 that acts on multiple rows of grain culms. A lifting pre-processing section 9 is equipped with a device 5, a conveying device 6 for merging harvested grain culms, and a rear grain culm conveying device 8 that supports the ears and stock heads and supplies the harvested grain culms to the threshing feed chain 7. , are connected to each other so that they can swing up and down around a rear fulcrum P.

The grain culm rear conveyance device 8 is configured to be able to swing up and down around the pre-processing section fulcrum P, and has a function as a handling depth adjustment device that changes the grain culm supply position to the threshing feed chain 7. ing.

2 and 3 show a structure for changing the position of the grain rear conveyance device 8, in which the output shaft 11 of the electric motor 10, which is capable of forward and reverse rotation, is changed in position via the worm reduction mechanism 12 and the chain 13. It is interlocked and connected to a link mechanism 14 for use.

The electric motor 10 is automatically reversed and reversed and stopped to automatically adjust the handling depth based on the detection result of a device 15 that detects the culm length of the grain culm being raised. The details will be explained next.

The culm length detection device 15 has three culm presence/absence detection sensors 15a, 15b, and 15c juxtaposed that are pressed and swung against the grain culm at appropriate intervals in the culm length direction of the raised grain culm. The oscillating displacement is detected by sensor switches Sa, Sb, and Sc, and 6.
It is configured to perform stepwise culm length detection. That is, the discrimination mechanism includes each sensor 15a.
...detected the presence of a culm from the absence of a culm,
This is to determine whether the presence of a culm is detected as the absence of a culm. As shown in FIG. 5, when all the sensors 15a... detect the absence of a culm, it is detected as the shortest grain culm _L1 , which is shorter than the position of the lower sensor 15c, and from this state, the lower sensor 15c detects the presence of a culm. When detected, a grain culm that is longer than this sensor position and shorter than the center position of the range between this lower sensor 15c and the intermediate sensor 15b is detected.
Detected as L ₂ , and from this state intermediate sensor 1
When 5b detects the presence of a culm, it is detected as a grain culm _L4 that is longer than this sensor position and shorter than the center position of the range between this intermediate sensor 15b and upper sensor 15a, and from this state, the upper When the sensor 15a detects the presence of a culm, it is detected as the longest grain culm _L6 , which is longer than the position of the sensor 15a. In addition, when the upper sensor 15a detects the absence of a culm from a state in which all the sensors 15a... detect the presence of a culm, the grain culm that is shorter than this sensor position and from the center position of the range between this sensor 15b If the intermediate sensor _15b detects the absence of a culm from this state, the grain culm is shorter than this sensor position and from the center position of the range between this sensor 15b and the lower sensor 15c. It is also configured to detect a long grain culm _L3 . In other words, the lower sensor 15c
and between the intermediate sensor 15b and between the intermediate sensor 15b and the upper sensor 15a, respectively.
It is divided into two culm length ranges, and is configured to perform culm length detection in six stages.

As shown in FIG. 3, a rotary sliding type switch mechanism 16 for detecting the position of the grain culm rear conveyance device 8 is connected to a fixed frame portion of the position changing drive section of the grain culm rear conveyance device 8. This switch mechanism 16
As shown in FIG. 4, the culm length detection mechanism 15
partial arc-shaped fixed contacts a, b, c, a', b', c' connected to sensor switches Sa, Sb, Sc, and relays 17, 18 for forward and reverse driving of the electric motor 10.
a pair of partially arc-shaped fixed contacts d connected to
d′, and a pair of movable contacts e, which can rotate integrally.
e', and the support member 19 of the movable contacts e and e' is connected to the output shaft 20 of the worm speed reduction mechanism 12 and is configured to rotate.

Further, Sd in FIG. 4 is a start switch for the automatic handling depth control operation, and is set to be ON only while the sensor 15d provided below the back of the lifting device 4 is pressed and swung backward. It is composed of
SW ₁ is a switch for switching between “manual and automatic”;
SW ₂ is a manual switch used for manual depth adjustment, and SW ₃ is a main switch.

Then, in order to control the grain to be handled more deeply as the grain culm becomes shorter, fixed contact d', movable contact e', fixed contact a',
Using the contact circuits b' and c', the deep handling side relay 17 is energized to drive the motor 10 in normal rotation to the deep handling side. The support member 1 is driven by this motor 10.
9 rotates clockwise and the movable contact e' is removed from the lowest one of the sensor switches Sa detecting the absence of a culm. At this point, the power to the relay 17 is cut off. As a result, the motor 10 will stop. Therefore, during deep handling control, F ₅ ,
It has stop positions F ₃ , F ₁ , and these positions F ₅ , F ₃ , F ₁ correspond to the detected grain culm length L ₅ , respectively.
It is set to correspond to each of L ₃ and L ₁ .

Conversely, when the grain culm becomes long and the grain is to be handled shallowly, the fixed contact d, the movable contact e, the fixed contact a,
Using the contact circuits b and c, the shallow handling side relay 18 is energized to reversely drive the motor 10 to the shallow handling side. The support member 1 is driven by this motor 10.
9 rotates counterclockwise and the movable contact e is removed from the topmost sensor switch Sa detecting the presence of the culm, at this point the power to the relay 18 is cut off. The motor 10 will stop. Therefore, during shallow handling control, near the counterclockwise ends of each fixed contact a, b, c,
It has stop positions F ₆ , F ₄ , F ₂ , and these positions F ₆ , F ₄ , F ₂ correspond to the detected grain culm lengths L ₆ ,
It is set to correspond to L ₄ and L ₂ .

According to the above configuration, the rear conveyance device 8 is automatically vertically swung according to the fluctuation of the culm length to stabilize the handling depth, and the movable contacts e, e' and the fixed contact a , b, c, a', b', c', while determining whether each of the sensors 15a, 15b, 15c detects the presence of a culm from the absence of a culm, or the absence of a culm from a presence of a culm. It is configured to detect the culm length in six stages and adjust the handling depth in six stages corresponding to this.

In addition, 21 in the figure is a capacitor, resistor, etc. provided to delay the start or stop of the automatic depth control operation by an appropriate set time (for example, about 0.6 seconds) even when the start switch Sd is turned ON or OFF. This is a delay circuit with a well-known configuration, and the start delay effect prevents unexpected handling depth control from being performed before the grain culm that activated the start switch Sd at the start of the reaping operation reaches the sensor 15a... Furthermore, even if the subsequent grain culm is not fed in due to the stop delay effect at the end of the reaping work or when there is a stock shortage, the handling depth control operation will not be stopped unexpectedly. This will prevent Also, 22
a and 22b are delay circuits that delay the operation of the relays 17 and 18 for an appropriate period of time, thereby preventing the handling depth from being adjusted even if the detected grain culm length suddenly changes; In order to stabilize the control and prevent overloading the threshing device 2, the delay time on the shallow handling side is set shorter than the delay time on the deep handling side. .

In the embodiment, movable contacts e, e' and fixed contact a
.

Further, the culm length detection result of the present invention may be displayed using a display mechanism using a lamp or the like.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the culm length detection device in the reaping harvester according to the present invention, in which FIG. 1 is a side view of the front part of the combine, FIG. 2 is a side view showing the position changing structure of the rear conveyance device, and FIG. The figure is a longitudinal sectional front view showing the position change structure of the rear conveyance device, and Figure 4 is a circuit diagram.
FIG. 5 is a rear view showing the culm length detection device. 15a...Sensor.

Claims (1)

[Scope of Claim for Utility Model Registration] A culm length detection device for a reaping harvester in which a plurality of culm presence/absence detection sensors 15a are arranged side by side at appropriate intervals in the culm length direction of a target grain culm, wherein each of the sensors 15a... A mechanism is provided to determine whether the presence of a culm is detected from the absence of a culm, or the absence of a culm from the presence of a culm, and based on the determination result, one of the sensors 15a... When the presence of a culm is detected, it is detected as a grain culm that is longer than this sensor position and shorter than the center position of the range between this sensor and a sensor adjacent to this on the ear tip side, and When the sensor detects from the presence of a culm to the absence of a culm, it detects a grain culm that is shorter than this sensor position and longer than the center position of the range between this sensor and a sensor adjacent to the plant base side. 1. A culm length detection device for a reaping harvester, characterized in that it is configured to detect the length of a culm. The culm length detection device for a reaping harvester according to claim 1, wherein the culm length detection result is used as a control signal for automatic handling depth adjustment in a combine harvester. The culm length detecting device for a reaping harvester according to any one of claims 1 to 2, wherein the sensors 15a are pressed and displaced by the grain culm.